User interface for a portion of a display screen



FIG. 1 is a front view of a user interface for a portion of a display screen showing our new design;

FIG. 2 is the front view of the user interface for a portion of the display screen shown in FIG. 1 with an area shown in dashed lines; and,

FIG. 3 is an enlarged view of the area shown in dashed lines in FIG. 2.

The dot-dash line showing of rectangular regions and the areas there within form no part of the claimed design. The dot-dash line showing of the display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a user interface for a portion of a display screen, as shown and described. 